You start to run out of words when you try and describe the impact that Lucas Torreira has made at Arsenal.

Each week, with each different performance, it’s a struggle to come out with the superlatives to do the little Uruguayan justice.

So many players who have arrived from abroad have needed time to settle in England, especially South American players, but Torreira already looks totally at ease with his surroundings.

Given it was his first north London derby on Sunday and given the nature of the opposition, there was a sense of intrigue about how Torreira would perform. Could he repeat previous performances? Could he be the difference maker against a top four rival? Both questions were answered emphatically.

Torreira was magnificent once again against Spurs and this time he capped his display with a goal, his first for the club. And you will not find a more popular goal scorer all season.

Torreira is the new darling of the Emirates, a £27 million darling, a £27m bargain! He is the player Arsenal have lacked for years and against Tottenham he proved once again he can be the driving force in midfield who can take Arsenal to a new level.

Razor sharp Aubameyang

Pierre-Emerick Aubameyang has now scored 10 goals from his last 10 shots on target in the Premier League. The last goalkeeper to save a goalbound Aubameyang shot was Lukasz Fabianski, way back in August in what was Unai Emery’s first win as Arsenal boss.

Pierre-Emerick Aubameyang celebrates scoring against Spurs.

When he arrived in January, there were whispers that he could be a divisive figure in north London, but that couldn’t be further from the truth.

Aubameyang has been a revelation and with him in the team you always have a chance. When Arsenal needed him most on Sunday, he stepped up and delivered.

Spurs has actually started the second half pretty well and there was some frustration setting in when Aaron Ramsey played the ball into Aubameyang’s path.

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This was up there with the best of occasions in terms of the Emirates, alongside that night against Barcelona, Henry’s injury time winner against Manchester United and Danny Welbeck’s dramatic return against Leicester.

The ground was rocking, it was like a bearpit at times, especially in the second half as the goals started to flow in. There is a sense of unity at Arsenal now forming between the team and the fans that has been lacking in recent years.

Any north London derby win is special, there has certainly been enough of them over the years, but Sunday felt a bit different - perhaps because it was the first of the new Emery era.

The Old Trafford test

Arsenal’s derby win ensured they head to Old Trafford on Wednesday sitting in the Premier League’s top four.

The unbeaten run has now moved on to 19 games in all competitions and the team spirit seems as good as it has been for a long time.

There is a belief growing at Arsenal now that they could be on their way back. But Wednesday night will be the latest test that the Gunners have to pass.

The sense of belief at Arsenal is growing.

Take Danny Welbeck’s winner in the FA Cup out of the equation and Old Trafford has been a miserable experience for Arsenal in recent years.

They haven’t won there since Emmanuel Adebayor’s late winner in 2006 and have suffered some embarrassing defeats along the way. No matter what sort or form they were in before the game, they always seem to crumble as soon as they headed out onto the Old Trafford turf.

So it will be interesting that see how they handle things on Wednesday night. They are facing a United side who are enduring a difficult season, but in the past that wouldn’t matter to Arsenal - as defeats against United sides managed by David Moyes and Louis van Gaal have shown. That 3-2 defeat in 2016 against a near United youth team was perhaps the worst of the lot.

So if they can head north on Wednesday and return with a result, it could be another real sign that things are changing for the better in north London.